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2. When expelled from the nucleus of an atom, a neutron is unstable and decay to form a proton and an electron.

Could someone find an error in the sentence please.
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Mmm... I think it goes like this:

"When explelled from the nucleus of an atom, the neutron is unstable and decays to form a proton and an electron".

Or should it be "...to form a proton or an electron?"

I cannnot guarantee that the scientifical information is true. Emotion: smile

Hope this helps! Emotion: smile